Chemical Equilibrium

What is true about chemical equilibrium?

• It is dynamic in nature

• Rate of forward reaction = Rate of backward reaction at equilibrium

• Composition of reactants and products do not change on reaching equilibrium

• All of above.

Tags

NGSS.HS-PS1-6

Which of the following changes the equilibrium constant?

• Pressure

• Temperature

• Concentration

• Catalyst

Tags

NGSS.HS-PS1-6

If the concentration of a reactant is increased then equilibrium shifts in

• Forward direction

• Backward direction

• Forward direction for endothermic reaction

• Backward direction for endothermic reaction

Tags

NGSS.HS-PS1-5

If equilibrium constant for a forward reaction is 10 then equilibrium constant for the backward reaction is:

• -10

• 10

• 1/10

• 0.01

When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:

• Chemical equilibrium

• Chemical reaction

• Chemical constant

• Chemical peace

Tags

NGSS.HS-PS1-6

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

• Chemical Equilibrium

• Chemical Balance

• Stoichiometry

• Chemical Reaction

Tags

NGSS.HS-PS1-6

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of products STAY the SAME"

• True

• False

Tags

NGSS.HS-PS1-6

Which is the correct equilibrium constant expression for the following reaction? Fe₂O_3(s) + H_2(g) —> Fe_(s) + H₂O_(g)

• K = [H₂O]3 / [H₂]³

• K = [Fe₂O₃] [H₂]³ / [Fe]²[H₂O]³

• K = [Fe]²[H₂O]³ / [Fe_2O₃] [H₂]³

• K= [Fe] [H₂O] / [Fe₂O₃] [H₂]

• K = [H₂O] / [H₂]

Tags

NGSS.HS-PS1-6

For any reaction at chemical equilibrium, the concentrations of products and reactants

• are equal.

• change

• remain unchanged

• decrease

Tags

NGSS.HS-PS1-6

Given the K_c for a forward reaction, how can you find K_c for the reverse reaction?

• Divide K_c by 1

• Divide 1 by K_c

• Square K_c

• Take the square root of K_c